package com.itheima.student.system02.entry;

import com.itheima.student.system02.domain.Student;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentEntry {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Student> list = new ArrayList<>();
        loop:
        while (true) {
            System.out.println("--------欢迎来到学生管理系统--------");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看学生");
            System.out.println("5 退出");
            System.out.println("请输入您的选择:");
            String choice = sc.next();
            switch (choice) {
                case "1":
                    //System.out.println("添加学生");
                    addStudent(list);
                    break;
                case "2":
                    //System.out.println("删除学生");
                    deleteStudent(list);
                    break;
                case "3":
                    //System.out.println("修改学生");
                    updateStudent(list);
                    break;
                case "4":
                    //System.out.println("查看学生");
                    findStudent(list);
                    break;
                case "5":
                    System.out.println("退出");
                    break loop;
                default:
                    System.out.println("输入有误,请重新输入");
                    break;
            }
        }


    }

    // 添加学生
    public static void addStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入学生的学号:");
        String sid =null;
        while (true) {
            sid = sc.next();
            int index = getExist(sid, list);
            if (index>=0){
                System.out.println("该学号已存在,请重新输入");
            }else{
                System.out.println("请继续下一程序:");
                break;
            }
        }
        System.out.println("请输入学生的姓名:");
        String name = sc.next();
        System.out.println("请输入学生的年龄:");
        int age = sc.nextInt();
        System.out.println("请输入学生的性别:");
        String gender = sc.next();
        System.out.println("请输入学生的生日:");
        String birthday = sc.next();
        Student student = new Student(sid,name,age,gender,birthday);
        list.add(student);
        System.out.println("添加成功!");
    }

    // 删除学生
    public static void deleteStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要删除的学生学号:");
        String sid = sc.next();
        int index = getExist(sid, list);
        if (index>=0){
            list.remove(index);
            System.out.println("删除成功!");
        }else{
            System.out.println("系统没有此学生,不必删除!");
        }


    }

    // 修改学生
    public static void updateStudent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要修改的学号:");
        String sid = sc.next();
        int index = getExist(sid, list);
        if (index>=0){
            System.out.println("请输入学生的姓名:");
            String name = sc.next();
            System.out.println("请输入学生的年龄:");
            int age = sc.nextInt();
            System.out.println("请输入学生的性别:");
            String gender = sc.next();
            System.out.println("请输入学生的生日:");
            String birthday = sc.next();
            Student student = new Student(sid,name,age,gender,birthday);
            list.set(index,student);
            System.out.println("修改成功!");
        }else{
            System.out.println("系统没有此学生,请添加!");
        }


    }

    //查看学生
    public static void findStudent(ArrayList<Student> list) {
        if (list.size()==0){
            System.out.println("系统没有学生,请录入学生信息");
        }
        System.out.println("学号"+"\t"+"姓名"+"\t"+"年龄"+"\t"+"性别"+"\t"+"生日");
        for (int i = 0; i < list.size(); i++) {
           // list.get(i)
            Student student = list.get(i);
            System.out.println(student.getSid()+"\t"+student.getName()+"\t"+student.getAge()+"\t"+student.getGender()+"\t"+student.getBirthday());
        }
    }

    // 判断学号是否重复
    // 参数    输入的sid     原有的ArrayList<Student> list
    //  返回值  index
    public static int getExist(String sid, ArrayList<Student> list) {
        for (int i = 0; i < list.size(); i++) {
            //  list.get(i)
            Student student = list.get(i);
            if (student.getSid().equals(sid)){
                return i;
            }
        }
        return -1;
    }

}
